直流叠加高频交流方波电场下乳化液电脱水试验研究

The experimental study on electric dehydration of emulsion under the electric field superposed DC and high frequency AC square wave

为了提高原油乳化液破乳效果和电脱水效率,提出采用直流叠加高频方波电场进行原油电脱水的方法。在实验室中开展了直流叠加高频方波电场下乳化液电脱水试验研究,分析该方法下乳化液中水滴的聚并机理,并借助于高速相机观察了乳化液中水滴的运动及水链的消散过程。理论与试验结果表明:采用直流叠加高频方波电场可充分发挥直流和方波电场下的各自脱水优点,使水链易于消散,保证脱水电场的稳定,提高乳化液的电脱水速度和脱水率,且叠加高频交流方波含量在10%～20%范围内,脱水效果最佳,研究结果可为原油生产现场的脱水工艺改进提供参考。

In order to improve the effect of electric demulsification and efficiency of the electric dehydra-tion of crude oil emulsion, the article puts forward the method of taking advantage of electric field super-posed DC and high frequency AC square wave for electric dehydration of crude oil. The article carried out the study on electric dehydration experiments of emulsion under the action of the superposed electric field, analyzed the coalescence mechanism under the action of the superposed electric field, and observed the movement of water droplets and the disappearance situation of water chain in emulsion using high speed camera in the laboratory. The theory and results show the superposed electric field can give full play to their respective advantages of DC and high frequency AC square wave electric field, make the wa-ter chain be easy to disappear, guarantee the stability of electric dehydration electric field, and improve the speed and efficiency of electric dehydration, and the efficiency is the highest when high frequency AC square wave content is between 10%~ 20%. The results can provide reference for electric dehydration process improvement of crude oil production site.